What is the TSQL syntax to format my output so that the column values appear as a string, seperated by commas.
Example, my table CARS has the following:
CarID CarName ---------------- 1 Porsche 2 Mercedes 3 Ferrari How do I get the car names as : Porsche, Mercedes, Ferrari
You can do a shortcut using coalesce to concatenate a series of strings from a record in a table, for example.
declare @aa varchar (200) set @aa = '' select @aa = case when @aa = '' then CarName else @aa + coalesce(',' + CarName, '') end from Cars print @aa SELECT LEFT(Car, LEN(Car) - 1) FROM ( SELECT Car + ', ' FROM Cars FOR XML PATH ('') ) c (Car) You can do this using stuff:
SELECT Stuff( ( SELECT ', ' + CARS.CarName FROM CARS FOR XML PATH('') ), 1, 2, '') AS CarNames If you are running on SQL Server 2017 or Azure SQL Database you do something like this :
SELECT STRING_AGG(CarName,',') as CarNames FROM CARS DECLARE @CarList nvarchar(max); SET @CarList = N''; SELECT @CarList+=CarName+N',' FROM dbo.CARS; SELECT LEFT(@CarList,LEN(@CarList)-1); Thanks are due to whoever on SO showed me the use of accumulating data during a query.
Another solution within a query :
select Id, STUFF( (select (', "' + od.ProductName + '"') from OrderDetails od (nolock) where od.Order_Id = o.Id order by od.ProductName FOR XML PATH('')), 1, 2, '' ) ProductNames from Orders o (nolock) where o.Customer_Id = 525188 order by o.Id desc (EDIT: thanks @user007 for the STUFF declaration)
DECLARE @SQL AS VARCHAR(8000) SELECT @SQL = ISNULL(@SQL+',','') + ColumnName FROM TableName SELECT @SQL Please try this with the following code:
DECLARE @listStr VARCHAR(MAX) SELECT @listStr = COALESCE(@listStr+',' , '') + CarName FROM Cars SELECT @listStr